EP0513809A2 - Méthode de traitement des fluides de refroidissement et/ou des lubrifiants utilisés dans des installations de laminage et dispositif à cet effet - Google Patents

Méthode de traitement des fluides de refroidissement et/ou des lubrifiants utilisés dans des installations de laminage et dispositif à cet effet Download PDF

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Publication number
EP0513809A2
EP0513809A2 EP92108213A EP92108213A EP0513809A2 EP 0513809 A2 EP0513809 A2 EP 0513809A2 EP 92108213 A EP92108213 A EP 92108213A EP 92108213 A EP92108213 A EP 92108213A EP 0513809 A2 EP0513809 A2 EP 0513809A2
Authority
EP
European Patent Office
Prior art keywords
oil
mill scale
process water
water
flotation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP92108213A
Other languages
German (de)
English (en)
Other versions
EP0513809B1 (fr
EP0513809A3 (en
Inventor
Werner Schimion
Willi Leineweber
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Siemag AG
Original Assignee
SMS Schloemann Siemag AG
Schloemann Siemag AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SMS Schloemann Siemag AG, Schloemann Siemag AG filed Critical SMS Schloemann Siemag AG
Publication of EP0513809A2 publication Critical patent/EP0513809A2/fr
Publication of EP0513809A3 publication Critical patent/EP0513809A3/de
Application granted granted Critical
Publication of EP0513809B1 publication Critical patent/EP0513809B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M175/00—Working-up used lubricants to recover useful products ; Cleaning
    • C10M175/04—Working-up used lubricants to recover useful products ; Cleaning aqueous emulsion based
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0009—Settling tanks making use of electricity or magnetism
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0084—Enhancing liquid-particle separation using the flotation principle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2221/00—Applications of separation devices
    • B01D2221/14—Separation devices for workshops, car or semiconductor industry, e.g. for separating chips and other machining residues
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S75/00—Specialized metallurgical processes, compositions for use therein, consolidated metal powder compositions, and loose metal particulate mixtures
    • Y10S75/962—Treating or using mill scale

Definitions

  • the invention relates to a process for the preparation of cooling liquids which are interspersed with metallic and / or other material contaminants for cooling and / or for lubrication, in particular for separating mill scale and oily or fat-containing substances from the process water of open cooling circuits in the metallurgical industry, in particular in rolling mill systems .
  • the invention also relates to a processing plant relating to this for carrying out the method.
  • the rollers of a hot rolling stand attack the workpiece do not have any solid foreign substances, as these would otherwise be rolled into the rolling stock and the corresponding batch may be completely scrap must be supplied.
  • the coolants and lubricants are therefore continually contaminated with a fine abrasion from the forming process.
  • the lubricants also produce aging products. Since these coolants and lubricants are constantly enriched with abrasion and other contaminants, they must be cleaned. Good and continuous cleaning of the coolants and lubricants not only significantly improves the operating behavior and service life of these media, but also optimizes the overall result of cutting and non-cutting forming technology.
  • a device for processing contaminants, residues and / or liquids containing aging products in rolling mill systems is known from DE-OS 36 16 426.
  • the contaminated liquids used for cooling and / or lubrication in the rolling mill systems are first collected in a collecting tank and pumped from there to several membrane filters, which are in a backwashing cycle and are cyclically activated.
  • the filtrate outlet of the membrane filter leads to a feed tank, from which the cleaned liquid can be drawn off by means of a feed pump and is fed to its intended use, for example the rolling mill to be cooled.
  • a separate settling vessel is provided for cleaning the heavily contaminated liquids that occur in the flushing processes in the membrane filters, on the strongly inclined bottom of which the contaminants settle and are fed to the deepest point of the bottom in such a way that they are discharged via a fume hood provided there.
  • Overflow channels are provided in the upper area of the settling vessel, into which the liquid pre-cleaned by settling can overflow.
  • the liquid collected in the overflow channels is pumped back at least partially and in a controlled manner by a pump to the membrane filters and is used there as a backwashing agent for cleaning the membranes arranged in the filters.
  • the method for treating the process water of open cooling circuits is characterized in that the coarse mill scale is separated from the contaminated process water by gravity sedimentation, that the medium and fine mill scale particles from the process water pre-clarified in this way, are preferably removed by magnetic separation, that the accordingly clarified operating water is separated into fractions by flotation, containing oil concentrate, water and finest oil scale particles with little oil, and that the single fraction, like clarified operating water, is reused as a coolant, the entire mill scale separated from the operating water is smelted as sinter and the oil-containing concentrate is either discarded or subjected to waste oil treatment.
  • the claimed method is carried out according to the invention in a treatment plant which is characterized according to claim 7 by a settling tank for the supply of used and contaminated process water and by a device for sedimentation coarse roller scale and a device for transferring the pre-clarified process water into a pump reservoir with an additional solid separator installed therein, preferably with a magnetic separator for medium and fine roller scale particles, and a device for transferring the post-clarified process water into a flotation apparatus with forced ventilation, the fraction outputs of which are provided with transport means for recycling of the fractionated products such as process water in the cooling circuit of the rolling mill system and for transferring the separated mill scale to a smelting system and for forwarding the oil-containing filtrate to a waste oil treatment plant.
  • the oil-containing concentrate ie the waste oil emulsion that is largely freed from solids and only binds certain H2O fractions, can be fed to waste oil processing without further ado and can then be fed to certain types of use.
  • the main advantage of the invention is therefore that the formation of the oily mill scale sludge which has been separated from the water cycles in rolling mill systems is completely prevented. As is known, these represent conventional Rolling mill sludges occurring and previously deposited, containing 20 - 30% oil, represent significant environmental impacts.
  • the clear water obtained during the flotation is filtered if necessary and then sprayed in a cooling tower, collected and returned to the consumer points in the rolling mill system.
  • the fraction outlet of the flotation apparatus for clarified process water is optionally connected to a filter, the filtrate outlet of which is connected to a cooling tower with a pump reservoir located underneath, the pump of which is connected to the cooling water consumers in the rolling mill system by means of connecting lines.
  • the repeated filtering of the clear water from the flotation apparatus is advantageously announced if there should be any malfunctions with solid breakthroughs in the flotation cell.
  • the low-oil mill scale particles separated during the flotation are ground, suspended in water and the suspension is separated into fractions by means of post-flotation, containing oil concentrate, water and finest mill scale particles.
  • this is done in that the fraction outlet of the flotation apparatus for separated mill scale particles is connected to a comminution machine, in particular a mill, the product outlet of which is connected to a suspension basin, the suspension line of which leads to a second flotation cell with forced ventilation.
  • Mechanical processing takes place in the mill the scale particles, whereby adhering oil particles can be detached completely or more easily detached in the downstream suspension tank.
  • Appropriate detergents such as surfactants or the like can expediently be added there.
  • the suspension prepared in this way can be separated into the three fractions mentioned in a particularly simple manner by means of post-flotation.
  • the oil-containing concentrate from the pre-flotation of the process water and the oil-containing concentrate from the post-flotation of the suspension be separated into several substance phases, in particular into the fractions of used oil, water and small amounts of mill scale ;
  • this is achieved in that the fraction outlet for the oil-containing concentrate of the first flotation apparatus and / or the second flotation apparatus is connected to a centrifuge, in particular to a three-phase separator with discharge openings for purified water, waste oil and solid.
  • a flowable waste oil is separated from the water treatment process, which can be filled into oil drums and can be stored without further ado before it is transported to a waste oil treatment plant or can be used again in the rolling mill.
  • the mill scale is created by combining the atmospheric oxygen with the iron.
  • the scale is composed of the various iron oxide forms FeO, Fe2O3 and Fe3O4.
  • the iron content is 70 to 75%.
  • sawdust, flame cutting and flame combustion are added in continuous casting and rolling mills.
  • the scale accumulates over a distance that extends from the mold to the loading facilities.
  • the tinder accumulates in the form of large patties and so-called fish.
  • the scale produced in rolling mills is at least 1 to 3% of the rolled material.
  • the cooling water supplied to the rolling process is advantageously used at the same time as a means of transport for the mill scale and other solids and for washing away the lubricants used, about 2 liters of oil or fat per ton of rolled steel.
  • scale channels are usually arranged in the foundation, which have a corresponding gradient to achieve a good wash-off effect.
  • the roughly clarified process water in the sedimentation basin 1 then flows through a magnetic separator 3 installed in a downstream pump receiver A separation level of 50 to 80% separated from the process water and stripped from the magnetic separator above the water level.
  • the medium and fine mill scale particles can still be classified as low in oil and can therefore be fed together with the coarse mill scale from the sedimentation basin 1 with the aid of the conveyor belt 19 to the smelting plant 21 after dewatering in a drainage basin 20. Due to the low oil content in the coarse mill scale as well as in the medium and fine mill scale particles separated by magnetic separation, there is no danger for the electrostatic filters used in such systems for dedusting during the smelting process.
  • the low proportion of oil-containing substances in the mill scale Z1 and Z2 in the first two cleaning stages results from the fact that the oil phase is not attached to those mill scale particles that have a relatively large surface area.
  • Magnetic separation must therefore not cause any significant turbulence, so that the oil phase cannot accumulate on the mill scale particles.
  • the process water contaminated with oil and grease and still contaminated with fine mill scale particles and with the finest mill scale particles (grain size about 0.001 mm), is then conveyed from the reservoir basin 2 via pumps 4 and line 5 to a flotation apparatus 6 standing above the hallway.
  • the clarified process water is separated into the fractions of oil concentrate, water and low-oil scale particles in the flotation apparatus.
  • the process water and its contents flow through the flotation apparatus, whereby air is introduced in the finest dispersion.
  • the finest particles in the process water as well as the oil and fat accumulate on the finely dispersed air bubbles to float with them.
  • a bubbly foam is formed, which is continuously drawn off and discharged in the upper area of the flotation cell via an adjustable annular space.
  • the oil concentrate thus obtained flows through a line 6.3 into a separator 7.
  • the introduced product is separated into the fractions of waste oil, water and extremely small proportions of the finest mill scale.
  • the process water clarified with the flotation apparatus 6 is passed through the line 6.1 with a gradient via a gravity filter 8 used as a post-filter, which should only perform its filtering tasks if the separating cut cannot be adhered to exactly in the flotation apparatus 6 and solids are clarified per se Excess process water.
  • the clarified operating water is passed into a cooling tower system 9, in which the water is sprayed, cools and is collected in the pump reservoir 10 arranged below it. In this cooling process, the water sprayed in the cooling tower is cooled back to the required operating temperature. From the pump reservoir 10, the cleaned process water W2 is pumped back to the consumers in the rolling mill system by means of the pump 11 and line 17.
  • the fine to the finest mill scale with a particle size between 0.001 mm to 0.5 mm separated from the operating water in the flotation apparatus to 90% to 95% is collected in the underflow 6.2 of the flotation apparatus and is conveyed from there to a mill 12.
  • the oily mill scale is ground in the mill and exposed to shear forces.
  • the product produced in this way passes into a suspension tank enriched with water, in which the oil phase is to detach again from the mill scale particles.
  • the suspension With the help of a displacement pump 14 and a pipeline 15, the suspension is introduced into a second flotation apparatus 16 for the purpose of post-flotation. In the flotation apparatus 16, the suspension is separated into three fractions in a process described for the flotation apparatus 6.
  • the resulting oil concentrate is fed to the separator 7 via a pipeline 16.1 and is separated in the separator as described above into waste oil, water and the smallest fraction of the finest mill scale.
  • the clarified water in the flotation apparatus 16 is supplied to the pump reservoir 2 by means of gravity via a pipeline 16.1. This amount of water, which can correspond to the amount of lost water, is returned to the water treatment circuit.
  • the finest and low-oil roller scale separated from the suspension in the underflow 16.2 of the flotation apparatus 16 Z3 is deducted there and gets together with the remaining mill scale Z1 from the sedimentation basin 1 and the mill scale Z2 from the pump reservoir 2 onto the sintering belt 19 and from there into the smelting plant 21 after dewatering in the drainage basin 20.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Lubricants (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
  • Physical Water Treatments (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)
EP92108213A 1991-05-15 1992-05-15 Méthode de traitement des fluides de refroidissement et/ou des lubrifiants utilisés dans des installations de laminage et dispositif à cet effet Expired - Lifetime EP0513809B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4115819 1991-05-15
DE4115819A DE4115819A1 (de) 1991-05-15 1991-05-15 Verfahren zur aufbereitung von in walzwerksanlagen benutzten kuehl- und/oder schmiermitteln und hierzu eine aufbereitungsanlage

Publications (3)

Publication Number Publication Date
EP0513809A2 true EP0513809A2 (fr) 1992-11-19
EP0513809A3 EP0513809A3 (en) 1993-03-17
EP0513809B1 EP0513809B1 (fr) 1997-10-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP92108213A Expired - Lifetime EP0513809B1 (fr) 1991-05-15 1992-05-15 Méthode de traitement des fluides de refroidissement et/ou des lubrifiants utilisés dans des installations de laminage et dispositif à cet effet

Country Status (5)

Country Link
US (1) US5534155A (fr)
EP (1) EP0513809B1 (fr)
JP (1) JP3159777B2 (fr)
AT (1) ATE159278T1 (fr)
DE (2) DE4115819A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2113490A1 (fr) * 2008-04-28 2009-11-04 Edgar Bonnaire Procédé et dispositif de séparation mécanique de matières brutes secondaires à partir des boues contenant du fer
WO2020152003A1 (fr) * 2019-01-22 2020-07-30 Sms Group Gmbh Dispositif et procédé pour décalaminer une pièce en mouvement
WO2022078672A1 (fr) * 2020-10-16 2022-04-21 Sms Group Gmbh Procédé de traitement des eaux de circuit de refroidissement contaminées par des substances organiques et des particules inorganiques
EP4403526A1 (fr) 2023-01-23 2024-07-24 BlueActivity® GmbH Procédé de traitement de l'eau dans des installations de refroidissement à circuit ouvert
DE102023101591A1 (de) 2023-01-23 2024-07-25 BlueActivity GmbH Verfahren zur Wasseraufbereitung in offenen Rückkühlwerken

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US6099562A (en) * 1996-06-13 2000-08-08 Schneider (Usa) Inc. Drug coating with topcoat
US20020091433A1 (en) * 1995-04-19 2002-07-11 Ni Ding Drug release coated stent
US5766450A (en) * 1996-09-25 1998-06-16 Bethlehem Steel Corporation Apparatus for magnetically filtering wastewaters containing oil-coated mill scale
DE19641465A1 (de) * 1996-10-09 1998-04-16 Schloemann Siemag Ag Verfahren und Vorrichtung zur Reinigung und Aufbereitung von in der Hüttenindustrie benutzten Kühl- und/oder Schmiermittel
JP4240566B2 (ja) * 1998-04-01 2009-03-18 ヤマハ発動機株式会社 クーラント浄化システム
TR200200033T2 (tr) * 1999-08-07 2002-04-22 Henkel Kommanditgesellschaft Auf Aktien İki fazlı yeni bir soğutucu-yağlayıcı sistem kullanan metal şekillendirme işlemi.
DE102007028737A1 (de) * 2007-06-21 2008-12-24 Ulrich Georg Hammer Verfahren und Vorrichtung zur Aufbereitung von Walzöl
WO2011092851A1 (fr) * 2010-01-29 2011-08-04 東芝三菱電機産業システム株式会社 Dispositif de commande d'injection d'eau dans une ligne de roulement, procédé de commande d'injection d'eau, programme de commande d'injection d'eau
DE102011016190A1 (de) * 2011-04-06 2012-10-11 OKO-tech GmbH & CO. KG Verfahren und Vorrichtung zum Entmischen und Trennen eines Stoffgemisches
RU175470U1 (ru) * 2016-11-30 2017-12-06 Федеральное государственное бюджетное образовательное учреждение высшего образования "Московский государственный технологический университет "СТАНКИН" (ФГБОУ ВО "МГТУ "СТАНКИН") Устройство очистки СОЖ
AT522690B1 (de) * 2019-11-26 2021-01-15 Lubot Schmierstoff Und Prozesstechnik Gmbh Aufbereitungseinrichtung und Verfahren zum Aufbereiten von mit Feststoffen beladener Prozessflüssigkeit
IT202100008330A1 (it) * 2021-04-01 2022-10-01 Danieli Off Mecc Impianto e procedimento per la rimozione di solidi sospesi, oli e grassi da acque di raffreddamento nel settore siderurgico e metallurgico
CN113399115B (zh) * 2021-07-29 2023-04-11 山东金玺泰矿业有限公司 一种矿产生产用铁质矿石分离提纯设备
CN115215500B (zh) * 2022-08-18 2023-12-08 合肥丰蓝电器有限公司 一种液冷机组用的冷却液过滤装置

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DE3146809C1 (de) * 1980-11-15 1982-11-04 Schauenburg Maschinen- und Anlagen-Bau GmbH, 4330 Mülheim Verfahren und Anlage zur Reduzierung des Ölgehaltes von ölverschmutztem Walzsinter
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2113490A1 (fr) * 2008-04-28 2009-11-04 Edgar Bonnaire Procédé et dispositif de séparation mécanique de matières brutes secondaires à partir des boues contenant du fer
WO2020152003A1 (fr) * 2019-01-22 2020-07-30 Sms Group Gmbh Dispositif et procédé pour décalaminer une pièce en mouvement
WO2022078672A1 (fr) * 2020-10-16 2022-04-21 Sms Group Gmbh Procédé de traitement des eaux de circuit de refroidissement contaminées par des substances organiques et des particules inorganiques
EP4403526A1 (fr) 2023-01-23 2024-07-24 BlueActivity® GmbH Procédé de traitement de l'eau dans des installations de refroidissement à circuit ouvert
DE102023101591A1 (de) 2023-01-23 2024-07-25 BlueActivity GmbH Verfahren zur Wasseraufbereitung in offenen Rückkühlwerken

Also Published As

Publication number Publication date
US5534155A (en) 1996-07-09
JP3159777B2 (ja) 2001-04-23
ATE159278T1 (de) 1997-11-15
DE4115819A1 (de) 1992-11-19
DE59208964D1 (de) 1997-11-20
EP0513809B1 (fr) 1997-10-15
EP0513809A3 (en) 1993-03-17
JPH05132678A (ja) 1993-05-28

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